Question

Розкрити дужки і спростити:

1) x - (x - (2x - 6))

2) 7a - ((b - a) + 7b)

3) 2m - (3m - (5m - (m + 1)); 4) 5t - (2t - ((m - t) - 2m))
СРОЧНО ПОЖАЛУЙСТА, ДАМ 25.Б

Answer 1

1) 2х - 6

2) 8а - 8b

3) 3m - 1

4) 2t - m

Answer 2

Ответ:

1)

$2x - 6$

2)

$8a - 8b$

3)

$3m - 1$

4)

$2t - m$

Объяснение:

1)

$x - (x - (2x - 6)) = \\ = x - (x - 2x + 6) = \\ = x - x + 2x - 6 = \\ = 2x - 6$

2)

$7a - ((b - a) + 7b) = \\ = 7a - (b - a + 7b) = \\ = 7a - b + a - 7b = \\ = 8a - 8b$

3)

$2m - (3m - (5m - (m + \\ + 1))) = \\ = 2m - (3m - (5m - \\ - m - 1)) = \\ = 2m - (3m - 5m + m + 1) = \\ = 2m - 3m + 5m - m - 1 = \\ = 3m - 1$

4)

$5t - (2t - ((m - t) - 2m) = \\ = 5t - (2t - (m - t - 2m)) = \\ = 5t - (2t - m + t + 2m) = \\ = 5t - 2t + m - t - 2m = \\ = 2t - m$